1734-TOP3
1734-TOP3
1734-TOP3
1734-TOP3
州仪器公司开发的TMS320C24X芯片使电机控制系统的设计者得以接触第一片专门为电机控制应用而优化的工业用单片DSP控制器。它将实时处理能力和控制器外设功能集于一身。它可产生所需的PWM信号来控制电机的转速，转向。可支持指令的产生，控制算法的处理，数据的交流和系统控制等功能。因此被广泛应用于自动化系统，工业电机驱动系统。本文介绍的就是一个电机调速系统的显示部分。TMS320F240便是在TMS320C24X基础上推出一种定点DSP芯片。TMS320F240主要结构和特性如下：
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⑴ 它是应用高性能的静态CMOS技术生产的。
⑵ 包含T320C2XLP内核CPU：有32位中央逻辑运算单元（CALU），32位累加器（ACC）,16位×16位并行乘法器，8个16位辅助寄存器。
⑶ 它本身具有工业温度标准、自动温度获取功能。
⑷ 它采用改进的哈佛总线结构，使得结构更加优化，芯片的性能提高。
⑸ 含544字节16位片内数据/程序双向RAM，16K字节Flash EEPROM。
⑹ 有串行外设接口（SPI）和通信接口（SCI），28个独立可编程，复用I/O口，还有双向10位串行数据转换器，采样速率可达166KHZ，满足实时性。
⑺ 功能强大的事件管理器，可通过比较单元产生所需的PWM。
⑻ 带有实时内部，外部中断和看门狗电路。
⑼ 支持JTAG硬件仿真。
2.SPI的原理和用法
目前控制系统微型化的要求越来越高，为了使数字处理系统微型化，必须舍弃常用的并行总线接口方案，采用只需少量引脚线的串行总线接口方案。SPI就是这样一种串行总线的外设接口，它只需3根引脚线便可与外设相接。SPI实际上是一种串行总线标准，它是一种真正的同步方式，两台设备在同一个时钟下工作，因此传输速率高达几十兆。现在与SPI总线兼容的芯片越来越多，因此，SPI为控制系统的设计带来了很大方便。
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